That helps a lot thanks, I'll order some cable & other bits later - but it also brings up another issue that I hadn't really thought about too much.

My motors are rated at 2.5A per phase & my controllers are also rated at 2.5A.

So my basic knowledge of electronics tells me that I should wire the motors as serial to match the controllers. But I see some mention in that thread of that having an impact on the torque of the motor.....so should I really be looking at running in parallel with a resistor? (I guess that ohms law applies here)